Carburetor valve



c., 2, 1924. 151mm E. B. @BBF-CRD ET AL CARBURETOR VALVE Eile@ Dec. 2o,1920 Patented Dec. 2, 1924.

STATES EDWARD'B. GIBFORD AND CHARLE'SWALKER GIBFORD, or ADRIAN,MICHIGAN.

CARBURETOR vALvE.

Application led December 20, 1920. Serial No. 431,889.

To all 'whom t may concern:

Be it known that we, EDa/'ARD B. G-Inronn and CHARLES 7. GIBFORD,citizens of the United States of America., residing at Adrian, in thecounty of Lenawee and State of Michigan, have invented certain new anduseful Improvements in Carburetor Valves, of which the following is aspecification, reference being had therein to the accompany ingdrawings.

This invention relates to carburetors and has among its objects toprovide means for more effectively commingling the liquid fuel withtheair, to so construct and arrange the mixing chamber that the air uponentering the mixing chamber will be deflected so as to thoroughlycommingling with the liquid fuel; to so construct and arrange the partsthat in the manufacture of the carburetor the necessity of coring isavoided, the mixing chamber being preferably divided so as to facilitatethe manufacture and assembly and to permit of ready access to thevarious working parts; and in general to provide a. new and improvedconstruction of the character above referred to. The invention furtherresides iu various features and in such combinations and arrangements ofparts as will more fully hereinafter appear.

In the drawings:

Figure 1 is a perspective view of the carburetor with the cap of thefloat chamber and one sect-ion of the mixing chamber removed;

Figures 2 and-3 are perspective views of the cap and removable mixingchamber section respectively;

Figure 4 is a central cross-section through Figure 3;

Describing 'in detail the particular embodiment of my invention shown inthe drawings, l designates the carburetor which comprises a floatchamber 2 and a mixing chamber These chambers are preferably castintegral with a connecting web portion 4. The'latter has a horizontalpassageway 5 leading from theinside of the float chainher to a verticalpassageway (i. 'At its lower end the passageway 6 is provided withL aIsuitable drain or pet-cock 7, while at its upper endits communicateswith the mixing chamber 3 through a port 8. This port is controlled bymetering pin 9 which extends threes-.l1 the erre-e sie@ the @sans and..

through the bushing lO threadedly engaging y and extending through thecasing.`

Suitable means are provided `for feeding the liquid fuel from the floatchamber 2 tothe mixing chamber 3 through the port `8. In the particularconstruction shown, Ythe feeding is controlled by maintaining` 'a whichhas a slotted portion surrounding the stem 23 and adapted to yieldablyengage in one of a` series of annular grooves 27 in the stem, -the clipbeing secured to the float 22. The cap 25 is removably held upon thefloat chamber 2 by a spring 28 pivoted to the wall of the mixingchamber.

After passing through the port 8 the fuel is commingled with the air inthe mixingl chamber 3, the particular construction and operation ofwhich chamber forms an important feature of my invention. In detail thechamber comprises a central cylindrical portion 29 and inclined walls3() and 31 arranged upon opposite sides of the cylindrical portion. 'Iofacilitate the manufacture, the inclined wall 31 is preferably formed onthev removable section or cap member 32 secured to the cylindricalsection by screws or other securing means .passing through co-operatinglugs 33. The valve 34 controlling admission of air to the mixing chamberis carried by the removable cap member 32, while the port 8 throughwhich the gasoline or other liquid fuel enters, tends transverselythrough the side wall of the cylindrical portion 29 and substantially atthe center thereof. The valre Si is in the form of a poppet valvenormally .held to its seat 35 by a spring 36. rlhe arrangement is suchthat whenever there is suction. placed upon the discharge passageway ofthe carburetor, leading to the intake manifold, the valve B4 will bedrawn away from its seat and air admitted to mix with the liquid fueldrawn through the port 8. Owing to the position of the valve, Yand thenovel arrangement 0f the inclined Wells 30, and .al the air lie enteringaround the periphery ot the valve will be deliected at various times bythe inclined walls and the cylindrical wall so as to produce eddies. Theemployment otl the enlarged mixing chamber having the walls arrangedsubstantially as shown in the drawings assures the desired .mixture inthe chamber. A further ieatu re oli the invention resides in making theupper end ot the port 8 cup-shaped to insure a supply ot the liquidfuel, particularly in starting.

For adjustably controlling the amount of air fed around the periphery ofthe valve 34, means for varying the amount of opening oi this valve awaytrom its seat is provided. In detail, the stem 37 ot the valve extendsthrough the guide way 38 formed by a bushing threadedly engaging the hubof the spider 39 upon the cap member' 32. The `free end of the stem hasa threaded engagement with the outer apertured end of a cap 40 withinwhich is the spring 36 coiled around the stem and abutting the washerLil. l2 is a lock nut threadedv upon the outer end of the stem formaintaining the cap in adjusted position. Rotation oiD the valve stem 37is prevented when rotating the cap 40 and lock nut ll by means ot thepin 43 eXtending through the stem and slidably engaging at its oppositeends the longitudinal slots La in the guideway 3S.

In addition to the adjusting means above described, for controlling theamount of opening of the air valve 34e there is a rockable member 45which is pivoted at L6 upon the cap member 32 and slotted at t7 to.receive the valve stem. rlhis slotted portion is elongated and thickenedtowards one end so as to provide an inclined surface 48 riding betweenthe flange i9 at the outer end of the guide way 38 and the abutmentwasher Lll. Normally this rockable member is positioned so that itsthinnest portion is between the llange 49 and the abutment washerI Lilbut whenever the operator wishes to temporarily restrict the amount ofopening of the valve it is only necessary to rock the member 45 aboutits pivot thus decreasing` the distance between the abutment washer 45and the cap 40, the ports being so arranged that at the end of thisrocking movement there is no Vplay between the abutment washer and capand consequently the valve cannot leave its seat.

ln order to secure bettereoinmingling of the air with the liquid fueland to permit ot a limited amount of air entering the mining chamber ofthe carburetor under certain conditions, as when the engine is ruimingidle, the Vvalve 34 is termed of two parallel spaced discs 50 and 5l,the outer one of which, 5l, is adapted to engage the seat 35 while theinner one 50, has its periphery slightly spaced :trom the inclined wall3l when the other is seated. The outer disk 5l has the axial aperture 52therethrough and the valve stem 37 is hollow, whereby air can be drawnthrough the valve stem and outer disk and pass into the mixing chamberaround the periphery of the inner disk when the outer disk is held toits seat by the rockable member 45. lith this arrangement the strengthof the coil spring 36 is not excessive so that it will properlyi'unction when the valve is released from its seat.

To prevent any air entering the mixing chamberj tor instance, when theengine is being started, l have provided the closure 53 secured to therockable member 45 and adapted to close the outer open end of the valvestem 37 when the latter is swung to the limit of its travel in theclosing direction to maintain the valve seated.

From the above description it will be apparent that the admission of airto the mining chamber is controlled by adjusting either the rockablemember i5 or by adjusting Vthe cap l0 and lock nut itl.

The construction as an entity is one in which very accurate adjustmentcan be made and the parts are so arranged that all portions ot thecarburetor are readily accessible either for repair or adjustment.Moreover, the novel construction of the mixing chamber not only securesa better mixture of the fuel and air but also permits the moreeconomical manufacture yand assembly of the parts owing to the meetingedges of the removable section and the main section lying insubstantially the plane of one edge of the cylindrical portion. It willbe understood that suitable gaskets are employed where they arenecessary and that various changes in details of construction andarrangements of parts can be made within the scope oit' the appendedclaims.

That we claim as our invention is:

l. ln a carburetor, the combination with an air inlet passage, ot avalve controlling said passage, a stem for said valve, a tap upon saidstem, a coil spring within said cap and engaging its outer end, and awedge-shaped member movable transversely of said stem and supporting theinner end ot said spring.

2. lin a earliuretor, the combination iviti an air ii iet passes ot avalve com-rollin.` said p age, a stein 'lor said valve,r a Pdeway forsaid stem permit L nal movement thereof, a cap tlneadedly enm gaging theouter end o.|z said stem, a washer sleeved upon said stem at the innerend of said cap, a coil spring surrounding said stem and abutting saidwasher and the'ouler end of said cap and a Wedge-shaped inem-- berengaging the inner side of said washer.

3. In a carburetor, the combination with an air inlet passa-ge, ot acombined detlector and valve controlling said passage comprising spacedparallel disks the outer disk only lll) CRU

being adapted to close said passage, a hollow stem for said valvecommunicating with the space between said disks and having a normallyopen outer end, and means for yieldably maintaining said outer disk inengagement with its seat.

il. In a carburetor, the combination with an air inlet passage, of acombined deflector and valve controlling said passage and comprisingspaced parallel disks, the outer of said disks only being adapted toclose said passage, a hollow stem for said valve communicating with thespace between said disks and having a normally open outer end, means forpositively closing said valve and means for closing the outer open cndof said valve stein.

5. In a carburetor, the Combination with an air inlet passage, of avalve controlling said passage, comprising spaced inner` and outerdisks, the outer disk only of which is adapted to seat, and meanspermitting of the passage of air through said outer disk into the spacebetween bot-h of said disks.

6. In a carburetor, the combination with an air inlet passage, of avalve controlling said passage including spaced discs, one disc beingadapted to seat, and means permitting of the passage of air through thelast mentioned disc into the space between both of said discs.

7. In a carburetor, the combination with a mixing chamber having aplurality of air inlet passages, of longitudinally adjustable springinfluenced means for controlling the supply of air through one passage,a member for regulating the spring influenced means, and a membermounted on the last mentioned member for controlling the supply of airthrough the other passage.

S. In a carburetor, the combination with a mixing chamber having an airinlet provided with a valve seat, of a valve for controlling the passageof air through the inlet including a pair of spaced discs, engageablewith the seat, one disc having al passage therethrough and a stemprovided with a longitudinal passage in communication with the passageaforesaid, and a closure for the passage in the stem.

9. In al carburetor, the combination with a mixing chamber having an airpassage leading thereto, of a valve controlling said passage, a stem forthe valve, a guide for the stem carried by the chamber, a cap connectedto the stem, a washer on the stem, a yieldable member between the washerand cap normally holding the valve closed, and means adjustable betweenthe guide and Washer for varying the movement of the valve.

10. In a carburetor, the combination with. a mixing chamber having aninclined wall forming a valve seat, and an air passage leading to theinclined wall, of a valve including spaced discs engageable with saidinclined wall for controlling the flow of air through the passage to thechamber.

11. In a carburetor, the combination with a mixing chamber having aninclined wall forming a valve seat and an air passage leading to theinclined wall, of a valve for controlling the flow of air through thepassage to the chamber including inner and outer discs, the. outer discbeing adapted to engage the seat when the inner disc is spacedtherefrom, the outer disc having a passage therethrough and being spacedfrom the inner disc whereby air may pass through the outer disc andbetween the inner disc and seat to said chamber.

12. In a carburetor, the combination with a mixing chamber having an airpassage leading thereto, of a valve controlling said passage, a stem forsaid valve, a guide for the stem, a cap connected to the stem, a washeron the stem, a yieldable member between the washer and cap normallyholding the valve closed, and a substantially wedge.

shaped member adjustable between the guide and washer for varying themovement of the valve.

In testimony whereof we aix our signatures.

EDIVARD B. GIBFORD. CHARLES VALKER GIBFORD.-

